Compiler Warning (level 1) C4382


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The latest version of this topic can be found at Compiler Warning (level 1) C4382.

throwing 'type' : a type with __clrcall destructor or copy constructor can only be caught in /clr:pure module

When compiled with /clr (not /clr:pure), exception handling expects the member functions in a native type to be __cdecl and not __clrcall. Native types with member functions using __clrcall calling convention cannot be caught in a module compiled with /clr.

If the exception will be caught in a module compiled with /clr:pure, you can ignore this warning.

For more information, see /clr (Common Language Runtime Compilation).

The following sample generates C4382.

// C4382.cpp  
// compile with: /clr /W1 /c  
struct S {  
   __clrcall ~S() {}  
struct T {  
   ~T() {}  
int main() {  
   S s;  
   throw s;   // C4382  
   S * ps = &s;  
   throw ps;   // OK  
   T t;  
   throw t;   // OK